https://www.wsi.de/fpdf/HBS-008896/p_wsi_report_97e_2024.pdf
https://ec.europa.eu/commission/presscorner/detail/en/ip_20_1968
http://www.ilo.org/wcmsp5/groups/public/—dgreports/—dcomm/—publ/documents/publication/wcms_548950.pdf
http://economics.mit.edu/files/12979